Gumshoe is an achievement in Halo 3: ODST and Halo: The Master Chief Collection. It is obtained by finding the 3rd clue in Campaign Mode; single-player or Co-op. It is worth 10 Gamerpoints.
- If you look behind the actual symbol, you can see the Marathon symbol imprinted in the background.
- "Gumshoe" is a reference to the first rubber soled "Sneakers" that were worn by Private Investigators to help them walk without being heard.
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